Standard gravitational lensing analysis relies on the Isochrony Axiom—the implicit assumption that the observed image represents a synchronous spatial snapshot of the source. For evolving sources, this approximation breaks down in the presence of conformal metric couplings, creating a "temporal composite" image. This projects temporal depth onto the spatial plane, generating a Temporal Shear contribution—arising from gradients in the scalar field's continuous spatial profile (Temporal Topology, TEP v0.8)—that is degenerate with gravitational shear in standard static lens reconstructions unless time-domain or variability-dependent observables are included. This phenomenon is defined here as Phantom Mass. GW170817 primarily constrains differential propagation and disformal cone tilt; it does not directly test common-mode conformal clock-rate structure along a shared path, although conformal scalar sectors remain indirectly constrained by PPN, equivalence-principle, source-screening, and clock-comparison tests. Because photons and gravitational waves traverse the same path, conformal time dilation is common-mode and cancels in differential measurements. Screening operates via the continuous flattening of Temporal Topology in dense environments, suppressing local field gradients without invoking discrete thin-shell boundaries. Conformal gradients may reproduce specific timing-sensitive aspects of dark-matter-like phenomenology—particularly in the time domain—without violating strong-lens arrival time constraints. The component conventionally attributed to dark matter may contain an unmodeled temporal-transport contribution. These results are derived in two regimes: a conservative Reference Envelope (millisecond-scale corrections, directly testable with lensed FRBs) and an Extended Regime (year-scale delays, possible dark-sector reinterpretation) whose validity is determined by the Variability-Mass Correlation test in existing strong-lens catalogs. Within the Extended Regime, where the Isochrony Axiom fails, temporal-field gradients produce an observational degeneracy with particulate dark matter. This is a conditional claim; the Reference Envelope result is the primary, unconditional contribution. Website: https://mlsmawfield.com/tep/gl/Code Availability: https://github.com/matthewsmawfield/TEP-GL DOI: 10.5281/zenodo.17982540 Keywords: gravitational lensing – dark matter – temporal equivalence principle – Temporal Topology – Temporal Shear – Phantom Mass – gravitational time dilation – scalar fields Open Science Statement: This work is a preprint and is open to community review, ideas, and collaboration. All materials required for full reproducibility—including data downloads, analysis scripts, code, and manuscripts—are open-source. Feedback and contributions to further test these results are welcome.
Matthew Lukin Smawfield (Fri,) studied this question.